Patent GB-296883-A (GB)
Title: Improvements in sheet delivery mechanism for printing machines
IPC: B65H29/16
Filed: 1927-08-18
Abstract: 296,883. Ranger, Ltd., H., and Ranger, A. W. Aug. 18, 1927. Delivery apparatus. In sheet delivery apparatus for printing- machines, of the type wherein a roller-blind support receives the sheet from the machine and deposits it on a pile table or on an endless tape carrier conveying the sheet to a table, a roller-blind support, after having received a sheet, is travelled in an extended position to the pile table, rolled up to deposit the sheet, and then moved back along a different path before being again extended to receive another sheet. As shown applied to a Wharfedale machine, Fig. 1, two roller-blind supports 63 are employed in order to speed up the delivery. The spring rollers 58 of the supports are mounted on brackets 56 carried by endless chains 54 moving in channelled guides 55 and passing over sprocket wheels 51, 52, and the free ends of the tapes or apron forming the support are attached to trailing bars 64 running on stationary guides 65. Adjustable jaws on the ends of each bar 64 frictionally engage the guides 65 so as to overcome the tension of the roller spring and cause the bar to trail behind the rollers 58 with the support extended. As each of the rollers 58 moves along the lower part of its path, the rollerblind support receives the sheet from the grippers 13, 15, delivering the sheet from the impression cylinder 2, and carries it over the pile. On beginning its backward movement along the upper parts of its path, the roller 58 winds up the support 63 as the bar 64 remains stationary at the point 70, and the sheet is deposited on the pile. Further movement of the roller 58 causes the support to unwind again, except in a modification where the upper part of the guide 65 is made thinner than the remainder so as to allow the bars 64 to slip, the support thus being prevented from unwinding again until it is beneath the sheet being delivered. A roller 72 is freely mounted on the shaft 27 of the sprocket so as 51 to support the tapes as the roller 58 passes thereover. Freely-mounted sections may be provided on the rollers 58 between the spring controlled sections carrying the tapes and of slightly larger diameter, so that these parts strike the sheet before the tapes and thus lessen the liability to rubbing. The grippers 13, 15 are carried by an arm 12 on a shaft 11 oscillated from the shaft 39 of the impression cylinder 2 through a cam 38, Fig. 3, and links 41, 43. 44, 50, 49 controlled by a spring 45. The shaft 27 is driven through a clutch 32 which is disconnected when side frames 4 carrying the delivery apparatus are lifted about the roller 52 to give access to the cylinder &c. As applied to an overhead-feed type of machine, the paths of the rollers 58 and the bars 64 are modified to provide room for the gripper mechanism, and the oscillating arm 12 is connected to a lever carrying the grippers which are thus given a rearward movement as well as an oscillatory one. The roller 58 may, by suitably disposing the guides 55, be caused to travel to the left, Fig. 1, parallel to the lower part of its path, for a short distance from its extreme right position before moving upwardly to clear its trailing bar 64 at 70. Gripper mechanism.-To open the movable jaw 13, Fig. 1, of the grippers to receive a sheet, its spring-actuated spindle 14 carries a cam 18 which engages a fixed roller 19, and the release of the sheet is effected by the engagement of a lever 21 on the spindle 14 with a tappet 20 on a spindle 22 oscillated by the engagement of a projection 23 thereon with a roller 24 adjustably clamped in a slot 28 on a toothed wheel 25 driven from the shaft 27.